The State Department also warned U.S. citizens to defer all nonessential travel to Ukraine.
"We have been very clear that we support an independent and unified Ukraine and that the idea of separation or partition or division is not in the interest of the Ukrainian people, of the Ukrainian nation, of Europe, or Russia, or the United States," White House spokesman Jay Carney told reporters Monday.
"This is not a competition between East and West. This is not a restoration of the Cold War. This is about the Ukrainian people and their future," he said.